> On 21 Feb 2019, at 10:29, David Freedman <[email protected]> wrote: > Silly thought perhaps, but how about asking them to use the DNS resolvers > provided by their ISP?
It could also be that the customer's access provider - CenturyLink, you said, Mark? - has routed them a block of PA which has history of being in these places. There are tools provided by the likes of Google for providers to geocode IP address space e.g. https://isp.google.com/geo_feed/ "You may provide Google with an IP geolocation data feed to help improve the location accuracy of Google products and services." Example: https://isp.google.com/static/downloads/example-geo-feed.csv But it does require the IP address "owner" to use them and keep such feeds up to date with some automation/exports/etc. Marek Isalski Technical Director, Faelix Limited, https://faelix.net/ Faelix Limited: Security, Networks & Software. Registered in England and Wales. Office: 13th Floor, City Tower, Piccadilly Plaza, Manchester, M1 4BT. Company: 5852778. VAT: 889 441470.
